Fix indentation in Makefile

Author: abcSup

Diff for: Makefile

@@ -516,7 +516,7 @@ DUMPING_DTB := 0
 .PHONY: android-dtb
 android-dtb $(ANDROID_DTB):
 ifneq ($(ARCH),arm64)
-    $(error android-dtb is only supported from arm64)
+	$(error android-dtb is only supported from arm64)
 endif
 
 # DUMPING_DTB=1 prevents infinite recursion. It must be set as a `make` argument,